Device for testing clays and the like



Dec. 1 6, 1930. J. F. MACKIN 1,785,521

DEVICE FOR TESTING CLAYS AND THE LIKE uFiled Nov. 15, .1928

Ihwentor JOSEPH EMAGKIN Gttomcg S ofthe groove have secured to'them a bracket Patented Dec. 16, 193i) STATES iATsmoerm-= JOSEPH F. MACKIN,

on COLUMBUS, OHIO qnnvrcn non TESTING oLAYs AND TI-IELIKE Application filed November 15,1928 Serial No. 319,504.

The object of. this invention is to provide an improved apparatus for testing or measuring the bonding strength of a plastic material-clay for instance.

The invention is embodiedin the example herein shown and described, the features of novelty'being pointed out in the claims.

In the accompanying drawing- Figure 1 is a view in side elevation of them apparatus according to the invention.

Fig. 2 is a top plan view, and

Fig. 3 is a cross section on the lineIII III looking to the left.

In the views 5 designates the base from 18 which rises a pair of pedestals 6, 6 and .tothe opposite sides of which'pedestals and equally distant from their center plane are. beds 7, 7.

Pivoted by means of adjustable conical a. bearings in the pedestal engaging 'corresponding sockets is a table 8 having a' longitudinal dovetail groove 9in which is slidable a weight 10, said weight having a tongue to engage it with said table. =The upper side p of the table is provided at each side of its middle beyond the ends of said weight-in its 1 middle position with a 'scale numbered in a serles from 1 to 15 inclusive and reading from themiddle of the table outward. The opposite extremities of the table and atthe ends that forms a stop 11 to prevent the accidental escape of the weight, and a screw 12 extending under the table provided with small weights'13 threaded on said screw so as to nicely balance the table when theQWeight thereon'is in its middle position.

Pivoted to the under side of the table at points equally distant fromlthe line of-the 4 table pivoting screws are pendent arms'or links 14 carrying pressure'heads-15 pivoted to the lower ends thereof. Each pressure head 15 normally lies a short-distance above its companion bed so that whenithe bed 7 is tilted by movement of. the weightin either direction from itsbalanced position the pres-g sure head at the corresponding side descends into contact with the companion head or with materialto betested placed on said bed.

. 50 The testing beds and their cooperating suspended plates are made of like form and area 1 then moved to apply the pressure head to the material after which the Weight is moved slowly and carefully in the opposite direction until the pressure head is removed from the bed below, the point on the scale coinciding with the end of the weight at which this 00- 6 .curs indicating in any desired units of force. the tenacity or bonding strength of the material. One side of the instrument can be used .for testing a single specimen of matetwo pairs of the testing members so that comparative' tests, can be made of apparently differing specimens at substantially the same time. V

The forms of the parts can bechanged .without departing from thegist of the invention as claimed. 7 I

JVhat I claim is: v

1. A device .for testing the bonding strengthof plastics and the like: including a base, a table pivoted on, said base, a bed adapted to'receive said material to 'be tested, .a'compression member carried bv the table to cooperate with said material receiving. bed and a slidable weight on said'table serving to 'sep arate the compression member from the material tested and indicatethe bonding V strength thereof. I l

2. Agzdevice. for testing the bonding strength of plastics and the like including a a compression member carried by the table to cooperate with said material ,recei\lng bed, afslidable weight on said table serving to separate the compression memberj'from the mater-ialitested "anda scale on thetable cooperating with the weight 7 to indicate bonding strength. ofthe material.

-- 3. Atesting device ofthe' kind described, M

base, a tablepivoted on. said base, a bed v adaptedto receive said materialtobe tested,

the: f

rial, but the instrument shownis made with including a base, a table pivoted on said base two beds for receiving the material to be tested at opposite sides of the pivotal point of the table, two compression members carried by said table cooperating with said beds,'and aweight slidable on said table from one side of the pivoting point to the other.

4. A testing :device of the kind described including abase, a table pivoted on said base, 10 two beds for receiving the material to be tested at opposite sides of the" pivotal. point of the table,'t Wo compression members carried by said table cooperating With said beds; a Weight slidable on said table vfrom one'side of the pivoting point to the other andsc'ales cooperating 'With saidw'eight to indicate the resultsof the tests. v

JOSEPH F.. MAOKIN. 

